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Advanced Organic Chemistry: Infrared spectrum of methoxymethane

Interpreting the infrared spectrum of methoxymethane (dimethyl ether)

Doc Brown's Chemistry Advanced Level Pre-University Chemistry Revision Study Notes for UK IB KS5 A/AS GCE advanced A level organic chemistry students US K12 grade 11 grade 12 organic chemistry courses involving molecular spectroscopy analysing infrared spectra of methoxymethane

C2H6O CH3OCH3 infrared spectrum of methoxymethane wavenumbers cm-1 functional group detection fingerprint pattern identification of dimethyl ether doc brown's advanced organic chemistry revision notes 

Spectra obtained from a liquid film of methoxymethane. The right-hand part of the of the infrared spectrum of methoxymethane, wavenumbers ~1500 to 400 cm-1 is considered the fingerprint region for the identification of methoxymethane and most organic compounds. It is due to a unique set of complex overlapping vibrations of the atoms of the molecule of methoxymethane.

Methoxymethane (dimethyl ether) alcohols and ether structure and naming (c) doc b alcohols and ether structure and naming (c) doc b alcohols and ether structure and naming (c) doc b alcohols and ether structure and naming (c) doc b alcohols and ether structure and naming (c) doc b

Interpretation of the infrared spectrum of methoxymethane

The most prominent infrared absorption lines of methoxymethane

The C-H stretching vibrations for a O-CH3 group occur at wavenumbers 2830 to 2815 cm-1.

The C-O stretching vibrations for a O-CH3 group occur at wavenumbers ~1250 cm-1.

The absence of other specific functional group bands will show that a particular functional group is absent from the methoxymethane molecular structure.


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